Number of valence electrons present in an element

Total number of d electrons present in an element with atomic number 78 is :-

What happens to number of valence electrons in atoms of elements as we go down a group of the periodic table ?

The sum of number of valence electrons and valency of an element with atomic number 15 is_____.

The first four ionization energies of an element are 191, 578, 872 , and 5962 "kca"l . The number of valence electrons in the element is.

The first four I.E. values of an element are 284, 412, 656 and 3210 kJ mol^(-1) . The number of valence electrons in the element are:

Maximum number of valence electrons possible in an atom are

number of electrons present in M shell of an element with atomic number 26 in its M^(3+) state will be

Atomic number of an element is 16. State The number of valence electrons in the element

Number of valence electrons in O^(2-) is :

The values of four quantum number of valence electron of an element are n = 4, l = 0, m = 0 and s=+(1)/(2) . The element is: